820481 has 2 divisors, whose sum is σ = 820482. Its totient is φ = 820480.

The previous prime is 820459. The next prime is 820489. The reversal of 820481 is 184028.

820481 = 640² + 641².

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 410881 + 409600 = 641^2 + 640^2 .

It is a cyclic number.

It is not a de Polignac number, because 820481 - 2¹⁰ = 819457 is a prime.

It is a super-2 number, since 2×820481² = 1346378142722, which contains 22 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (820489) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 410240 + 410241.

It is an arithmetic number, because the mean of its divisors is an integer number (410241).

2⁸²⁰⁴⁸¹ is an apocalyptic number.

820481 is the 641-st centered square number.

It is an amenable number.

820481 is a deficient number, since it is larger than the sum of its proper divisors (1).

820481 is an equidigital number, since it uses as much as digits as its factorization.

820481 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 512, while the sum is 23.

The square root of 820481 is about 905.8040626979. The cubic root of 820481 is about 93.6173139252.

The spelling of 820481 in words is "eight hundred twenty thousand, four hundred eighty-one".